Command to create or convert shared VM

I am using Workstation 10.0.5, and I'm trying to do what seems like a simple task, but I have been unable to find any documentation or discussions on how to do it.

I have a script which uses the ovftool to import an OVF, and then it uses vmrun -T ws to start the VM.  However, I would like to modify this either to create or convert the VM to be a shared VM, allowing it to auto-start without a user.  It is very simple to do through the UI:  Manage --> Share, but I want it to be hands-off for the user.

Any suggestions?

Thanks.